Move media/audio files into media namespace

media/audio/linux/audio_manager_linux.cc

Index: media/audio/linux/audio_manager_linux.cc
diff --git a/media/audio/linux/audio_manager_linux.cc b/media/audio/linux/audio_manager_linux.cc
index 27d574975aa79f3f00ff1d9fb0627de39237ba98..0b34aaa81186e0e6a491895c8364c5817cab0e39 100644
--- a/media/audio/linux/audio_manager_linux.cc
+++ b/media/audio/linux/audio_manager_linux.cc
@@ -23,6 +23,8 @@
 #include "media/base/limits.h"
 #include "media/base/media_switches.h"
 
+namespace media {
+
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 50;
 
@@ -309,3 +311,5 @@ AudioInputStream* AudioManagerLinux::MakeInputStream(
 AudioManager* CreateAudioManager() {
   return new AudioManagerLinux();
 }
+
+}  // namespace media